Electrically operated text writing device for bookkeeping machines



Jan. 27, 1959 Filed Sept. 20, 1955 F. HUBL ELECTRICALLY OPERATED TEXTWRITING DEVICE FOR BOOKKEEPING MACHINES 2 Sheets-Sheet 1 F.HwbL

Jan. 27, 1959 F. HUBL 2,870,897

ELECTRICALLY OPERATED TEXT WRITING DEVICE FOR BOOKKEEPING MACHINES FiledSept. 20, 1955 2 Sheets-Sheet 2 INVENTOP ELECTRICALLY OPERATED TEXTWRITING DEVICE FOR BOOKKEEPING MACHINES Fra z Hiibl, Goteborg, Sweden,assignonto Keinzle Apparate .G. in. b. H., Villingen, Schwarzwalrl,Germany The invention relates to an electrically operated text writingdevice for bookkeeping machines.

Electrical typewriters are known, wherein the type striking operation iseffected by the motor, the known pivotable type bars supported insegments being moved by rotary cams associated with each key andeachtype bar respectively. Such devices result in appliances toointricate for motorized manual typewriters.

In order to obtain a simple and inexpensive construction with reliableeffect, a rotary motor driven type wheel is provided which is stopped,in the respective positionscorresponding to the selected keys by means.of stops operated by pressure on the respective keys, and is caused tostrike. In an advantageous embodiment, cams are mounted on a shaft. Theshaft is driven by a slip clutch. through a gear wheel actuating thetypewheel and posi-- tioned on a pivoted lever carrying the type wheel.The cams are actuated by key operated stops in such manner that theystop the type wheel in a respective position, wherein the typecorresponding to the pressed key is in. printing position. The gearwheel journaled on the: pivoted lever and the gear wheel mounted on thecam shaft are positioned so that their pitch circles extend in,

a short distance from the pivotal axis of the pivoted lever,

The direction of rotation of the gear wheel on the pivoted lever is suchthat after stopping the cam shaft the pivoted. lever is swung instrikingdirection by the gear wheel. on the pivoted lever rolling on the gearwheel on the cam shaft. To insure reliable performance of each operation(type print), a locking frame is provided catching the respectivelypressed key in operational position- The locking frame is returned fromthe locking position by the pivoted lever e. g. by means of apin thereonin the striking position of the pivoted lever.

An embodiment of the invention is shown in the drawmg. i

Fig. 1 is an end elevational view of the device according to the instantinvention;

Fig. 2 is an elevational view of the device of Fig. 1;

Fig. 3 is a plan view of the device of Fig. 1; and

Fig. 4 is a side view of aportion of Fig. 1 in an operative engagingposition.

Referring now to Fig. 1, below a printing spot of a platen 1, thepivoted lever 3 is journaled on an axis 2. A type wheel 4 is journaledon the pivoted lever 3. A shaft 6 with a gear wheel 7 is driven indirection of the arrow by a motor (not shown) through a slip clutch 5.This wheel drives a gear wheel 8, mounted on the type wheel 4, throughgear wheels ll, 10, 9. The pivoted lever 3 is drawn into the position asshown by a spring 12. The gear wheel 11 also engages a gear wheelsecurely mounted on a shaft 14 and to which its rotary movement istransmitted. The position of the gear wheels 11 and 15 is such that thetwo pitch circles extend in a short distancefrom the axis 2 so that thegear wheels 11 and 15 maintain engagement during swinging movement ofthe pivoted lever 3. As more clearly United States Patent 1 O 2,870,897l aient ed Jan. 27, 1959 TCC shown in Figs. 2 and each letter of thetype wheel 4 has a corresponding stop 16 securely mounted onthe shaft14, and each stop 16 hasla corresponding latch 17. t

The latches 17 are pivotally mounted on a shaft 18 and are eachconnected to a key 20. t

On depressing a key 20, the associated latch 17 is moved into the pathof its associated stop, 16. The type wheel is stopped in such mannerthat the selected letter of the type wheel 4 is in printing position.Theugearl wheel 15.

' is locked, and since the gear wheel 11 continues to rotate,

and that downwardly at its point of engagement with the gear wheel 15,it rocks the pivoted lever 3 in a clockwise direction. By thisrockingmovement the letter is printed. The pivoted lever Scarries on itslowerarm 21 a pin 22 which, at the moment of printing, rocks a lockingframe 23 t to release the latch 17 which upon depression of theassoposition by the spring actuated ciated key had been held .in lockingframe 23. The spring .12 now returns the type wheel into position ofrest. Since blocking of the gear wheel 15 is released and the slipclutch 5 pulls through,

all wheels turn again till the. next key is struck. Upon each stroke ofa key anindexing device (here not shown) is actuated in a known mannerfor advancing the carriage. l a

In order to obtain straight line writing, a toothed correcting wheel 24shown in Fig. 2 is mounted on the type wheel, the wheel beingstraightened by a centering element 25 positioned just in front of theprinting spot.

What I claim as my inventionand desire to secure by Letters Patent ofthe United States is:

1. In an electrical typewriter, thecombination of a. platen for thepaper to be written upon; a type wheel shafts; a gear wheel fixed onsaid driven shaft; a second gear wheel journaled on said lever andmeshing with said first gear wheel; a third gear wheel on said typewheel;

the paper to be written upon;

. plurality of a gear train on said lever, connecting said second andthird gear wheels, whereby said type wheel isrotated by said drivenshaft; a counter shaft; a fourth gear wheel fixed on said counter shaft;meshing with said second gear wheel, and adapted to rotate said countershaft; a plurality of stops fixed on said counter shaft andcorresponding with the type characters on said type wheel, respectively,said stops being moved in circular paths by rotation of said countershaft; a plurality of latches adapted to co-act with said stops,respectively; and 21 keys corresponding with the type characters on saidtype wheel, and adapted to move said latches into the paths of rotationof said stops, respectively, to stop rotation of said counter shaft andsaid fourth gear wheel mounted thereon, said second and fourth gearwheels being so disposed relative to the pintle of said lever that, whenrotation of said fourth gear wheel is stopped, said second gearwheelrolls on said stationary fourth gear wheel and thereby rocks saidlever to cause said type wheel to move toward said platen to print theselected character on the paperon said platen.

2. An electrical typewriter, according to claim I, having a lockingframe pivotally mounted adjacent said latches, and biased to normalposition to lock said latches in operative position, and a pin on saidlever adapted to move said frame to unlock said latches.

3. In an electrically operated textwriting device for bookkeepingmachines, the combination of a platen for a type wheel bearing typeposed that thewheel prints its characters upon the paper when saidleveris rockedfrorn its normal position; drivingmeans and: toothed-wheelgearing means, the latter being disposed between said driving means andsaid type wheelg-and means adapted to interrupt rotation of saidtypewheel when a'selected character is positioned rela-- tive to saidplaten for printing said character, said toothedwheel gearing meansbeing adapted to transmit driving movement from saiddriving means tosaid type Wheel and to-transmit the effect ofsaidinterrupting-means fromthelatter to-saidtype Wheel, saiddriving means and said interruptingmeansco-operat in'g against the action of said springmeans to rock saidlever to print said selected character.

- 4..In an electrically operated textwriting device for bookkeepingmachines, the combination of a platen for the paper to be written upon;a type wheel bearing type characters; a lever pivotally mounted on afixed pintle, biased to normal position, on which said type wheel isjournaled, said- Wheel and said platen being so relatively disposed thatthe wheel prints its characters upon the paper whensaid leveris-rocked:from its normal position; a drive shaft adapted to be electricallydriven; a driven shaft; a slip clutch connecting said shafts; a gearwheel fixed. on said driven shaft; a second gear wheel journaled on saidlever and meshing with said first gear wheel; a third gear. wheelon-said type wheel; a gear train on said lever, connecting said secondand third gear wheels,

whereby said type wheel isrotated by said driven shaft;

a counter shaft; a fourth gear wheel fixed on saidcounter shaft; meshingwith said second gear wheel, and adapted to rotate said counter shaft;andsele'ctable interruption means adapted to interrupt rotation ofsaidcounter shaft in selected positions.

5'. In an electrically operated textwriting device for bookkeepingmachines the combination of a platen for the paper to be written upon; alever pivotally mounted on a fixed'pintle; spring means retaining saidlever in a normal; inoperative position; a type wheel bearing typecharacters journaled on said lever, said type wheel and said platenbeing so relatively disposed that the wheel prints its characters uponthe paper when said lever is rocked from its normal position; means forinterrupting rotation of said type wheel when a selected character ispositioned relative to saidplaten for printing of said characteronthepaper; drivingmeans; toothedwheel gearing meansdisposed, between saiddriving means and said type wheel fortransmitting driving movement tosaid type wheel-and-fortransmitting the action of said interruptingmeans to said type wheel, said driving means and said interrupting meansbeing adapted to co-operate againstthe action of saidspring means torock said lever to print said selected character; and means for insuringthecorrect'position-of said'selected'character relative to said platenduring the printing thereof,

6. in an electrically operated textwriting device for bookkeepingmachines,the combination of a platen for the paper to be printed upon;ai type wheel bearing type characters; a lever pivotally mounted on afixed pintle; spring means for retaining said lever in-a normal,inoperative position, said type wheel being journaled on said lever,

and said type wheel andsaid platen being so relatively disposed thatsaid wheel prints its characters upon the paper when said lever isrocked from its normal position; driving means and toothed wheel,gearing means, the

latter being disposed between. said driving..means and. said type Wheel;means for interrupting rotation of said type Wheel when aselectedcharacter is positioned rela-.

tive to said platen for printing thereof, saidtoothed wheel gearingmeans being adapted to transmit rotational driving movement from saiddriving means to said type wheel Y and also to transmitthe action ofsaid interrupting means from the latter to said .type Wheel, saiddriving means and said interrupting means, being adapted to co-operate,

against the action of said spring meansto rock said lever to print saidselected character, and meansfor insuring the correct positioning ofsaid selected character relative 'to said platen during the printingthereof.

References Cited in the file of this patent UNITED STATES PATENTS819,998 Jarvis May 8, 1906 1,520,089 Scherbius Dec. 23, 1924' 2,165,224'Chisholm July 11, 1939 UNITED STATES PATENT OFFICE CERTIFICATE OFCORRECTION Patent No. 2,870,897 January 27, 1959 Franz Hfibl In thegrant, lines 1 to 3, for "assignor to Keinzle Apparate G. m. b. H. ofVillingen, SchWarzWald, Germany," read as's'ignor to Kienzle ApparateG.m. b. H., of Villingen, SchWarzWald, Germany, line 12, for "KeinzleApparate G. 111. b. H. its successors read Kienzle' Apparate G. m. b. H.its successors in the heading to the printed specification, lines 4 to6, for "assgignor to Ke-inzle Apparate G. 111. b. H. Villingen,Schwarzwald, Germany" read assignor to Kienzle Apparate G. 111. b. H.Villingen, Schwarzwald, Germany Signed and sealed this 23rd day of June1959.

(SEAL) Attest:

KARL H. AXLINE ROBERT C. WATSON Attesting Officer Commissioner ofPatents

